LF> What he has is a *bad*  urinary tract infection,
 LF> more of a blockage (maybe kidney stones?).
It's sharp-edged little crystals, like jagged salt, which
can be disolved internally if you catch it *early* with
small doses of Vitamin C.  That is, VC will make them
more comfortable, it's *not* a cure.
OTOH, I've never had a male cat who got blocked by
crystals, but Sarah would get this every November, and
Porsche got it every March.  They were so regular with
their problem, I got accustomed to watching for it.  :(
May I add my condolences to you and Poc-Poc, he's been
throught a very painful experience, and it must make
you feel helpless.
For the novice cat owners:
I kept 250 mg VC tablets on hand and broke them into
8 pieces and popped them down the affected cat's throat
every hour or so.  This kept them comfortable until I
could either get them to the vet or get a prescription
into them.  There isn't a danger of overdosing with
frequent small doses of VC, their body takes what it
needs of the C and the remainder is excreted. It is that
excreted acid that helps disolve the sharp edged of the
crystals and makes them more comfortable.  The vet may
prescribe some little red pills that turn the cats urine
red/orange.  These pills do the same thing VC does.
If any of you notice your cat visiting the litterbox
frequently and just sitting there and concentrating,
producing little pee or none at all, crying in the
litterbox, or deviating from their training and leaving
little urine spots all over the house, with or without
a pink stain or blood, GET THEM TO THE VET IMMEDIATELY.
Urinary tract infections are quick killers.
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